如何在MS Select中设置变量 [英] How to set variable in to Ms Sql select
本文介绍了如何在MS Select中设置变量的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何在MS Sql中设置选择变量,主意如下所示:
How can I set in MS Sql select variables, idea looks like this:
Declare @var int
SET @var = 0;
Select (if(idid = @var) then sum+1 else sum-1) AS Sum,
set @var = id
FROM table
根据评论进行编辑.
DECLARE @T TABLE
(
ID INT PRIMARY KEY,
IDID INT,
SUMM INT
)
INSERT INTO @T
SELECT 1,1,4 UNION ALL
SELECT 2,1,5 UNION ALL
SELECT 3,2,6 UNION ALL
SELECT 4,2,7 UNION ALL
SELECT 5,3,8
在选择结果中,我需要:
In select result I need:
ID IDID SUMM
-- ---- ----
1 1 4
2 1 0
3 2 6
4 2 0
5 3 8
推荐答案
您要这样做吗?
Declare @var int, @id int
SET @var = 0
SELECT @id = id FROM Table t
if(@id = @var)
BEGIN
SET @var = @var + 1
END
ELSE
BEGIN
SET @var = @var - 1
END
print @var
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